What is Yellow fog weld defect? how to determine

“Yellow fog” is not a standard term in welding to describe a specific weld defect. However, based on the description, it may refer to a situation where the shielding gas used in gas metal arc welding (GMAW) or gas tungsten arc welding (GTAW) appears yellow or discolored during the welding process. This discoloration can be indicative of contamination or impurities […]